Exposing C++ templated classes in Pybind11

[apalha]

Summary

C++ code to expose to Python contains templated classes. The way these classes are currently expose via Pybind is via meta programming and structs with recursion. This is convoluted and very inreadable/not understandable.

Reproducibility

This construct is available in this example of the repository, specifically in the files:

• py_interpolator_exposer.hpp
• globals.h
• py_operator_set_interpolator_pz.cpp

Tasks

1. Understand the correct way of exposing templated class
2. Understand the recursive procedure currently implemented